The invention discloses a safe and high-energy USB (Universal Serial Bus) rechargeable battery, which comprises a metal shell, a positive pole component, a protective circuit board, a battery cell andan explosion-proof plug, wherein the explosion-proof plug is used for sealing the battery cell in the metal shell; the battery cell comprises a coiled cell, a positive pole pin, a negative pole pin and the metal shell; a shell of the battery consists of the metal shell; the protective circuit board is arranged on a protective board supporting structure; the battery cell is electrically connectedwith the protective circuit board through a socket arranged on the protective circuit board; the protective circuit board is provided with a USB interface used for charging the battery; the explosion-proof plug comprises an explosion-proof plug main body; the explosion-proof plug main body is provided with a pressure relief part which strength is lower than that of the explosion-proof plug main body; two ends of the pressure relief part are communicated with the interior and a pressure relief area of the metal shell respectively. By adopting the technical scheme, the capacity of the battery cell can be increased by approximately 20 to 50 percent; meanwhile, the protective circuit board is directly welded on the battery cell; the upper end protective circuit board and the battery cell are collected by adopting a socket connector way during assembly, and the whole assembly procedure is simplified.